Group 3: Class C, Test load ≥ 250 kN ~ 25 metric ton.
For gully tops installed in the area of kerbside chanels of road which when measured from the kerb edge, extend a maximum of 0.5m into the carriageway and a maximum of 0.2m into the footway.

Group 4: Class D, Test load ≥ 400kN ~ 40 metric ton.
Used in carriageways of roads and parking areas, for all types of road vehicles.